[Gluster-devel] Segfault at cache read_dir

[Dongmin Yu]

Hello,

 

To isolate the issue, I created a simple test case.

 

void readdir_test()

{

    struct dirent *dirp = NULL;

glusterfs_dir_t dirfd = NULL;

char *path = "/hs2/m/min001";

    dirfd = glusterfs_opendir( path );

    while( (dirp = glusterfs_readdir(dirfd)) != NULL ) {

        printf("%s\n", dirp->d_name );

    }

    glusterfs_closedir( dirfd );

}

 

I'm using CentOS 64bit. The configuration was not the issue. 

This test works fine with 2.0.7 but does endless loop with 2.0.8 client.

 

Thanks

 

DongMin Yu

 

HOSTWAY IDC Corp. / R&D Principal Researcher

TEL. +822 2105 6037

FAX. +822 2105 6019

CELL. +8216 2086 1357

EMAIL: min.yu at hostwaycorp.com 

Website: http://www.hostway.com 

 

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From: gluster-devel-bounces+min=hostway.co.kr at nongnu.org
[mailto:gluster-devel-bounces+min=hostway.co.kr at nongnu.org] On Behalf Of
Dongmin Yu
Sent: Tuesday, November 24, 2009 8:01 PM
To: gluster-devel at nongnu.org
Subject: [Gluster-devel] Segfault at cache read_dir

 

Hello

 

I'm using GlusterFS-2.0.8 and I turn on readahead. I got a Segfault when
I try to read a directory.

At the following trace, fd_ctx->dcache seems to be NULL

 

 

volume readahead

  type performance/read-ahead

  option page-count 4           # 2 is default option

  option force-atime-update off # default is off

  subvolumes distribute

end-volume

 

 

 

Program received signal SIGSEGV, Segmentation fault.

0x00002aaab4b03606 in libgf_dcache_readdir (ctx=<value optimized out>,

    fd=<value optimized out>, dirp=0x2aaab31cd7f8, offset=0x4f9d2248)

    at libglusterfsclient.c:398

398             *offset = fd_ctx->dcache->next->d_off;

(gdb) bt

#0  0x00002aaab4b03606 in libgf_dcache_readdir (ctx=<value optimized
out>,

    fd=<value optimized out>, dirp=0x2aaab31cd7f8, offset=0x4f9d2248)

    at libglusterfsclient.c:398

#1  0x00002aaab4b100d9 in libgf_client_readdir (ctx=0x2aaab31cd80b,

    fd=0x2aaab48e0928, dirp=0x0, offset=0x0) at
libglusterfsclient.c:4151

#2  0x00002aaab4b1047f in glusterfs_readdir (dirfd=0x2aaab319b310)

    at libglusterfsclient.c:4253

#3  0x00002aaab48e7e38 in gluster_readdir (self=<value optimized out>,

    args=0x2aaab4824840) at glusterfs.c:1035

 

(gdb) p  fd_ctx->dcache->next->d_off

Cannot access memory at address 0xb8

(gdb) p  fd_ctx

$1 = (libglusterfs_client_fd_ctx_t *) 0x2aaab31cd7c0

(gdb) p  fd_ctx->dcache

$2 = (struct direntcache *) 0x0

 

 

DongMin Yu

 

HOSTWAY IDC Corp. / R&D Principal Researcher

TEL. +822 2105 6037

FAX. +822 2105 6019

CELL. +8216 2086 1357

EMAIL: min.yu at hostwaycorp.com 

Website: http://www.hostway.com 

 

NOTICE:  This email and any file transmitted are confidential and/or
legally privileged and intended only for the person(s) directly
addressed.  If you are not the intended recipient, any use, copying,
transmission, distribution, or other forms of dissemination is strictly
prohibited.  If you have received this email in error, please notify the
sender immediately and permanently delete the email and files, if any.

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